<!--
  ~ Copyright (c) 2016-2017 Daniel Ennis (Aikar) - MIT License
  ~
  ~  Permission is hereby granted, free of charge, to any person obtaining
  ~  a copy of this software and associated documentation files (the
  ~  "Software"), to deal in the Software without restriction, including
  ~  without limitation the rights to use, copy, modify, merge, publish,
  ~  distribute, sublicense, and/or sell copies of the Software, and to
  ~  permit persons to whom the Software is furnished to do so, subject to
  ~  the following conditions:
  ~
  ~  The above copyright notice and this permission notice shall be
  ~  included in all copies or substantial portions of the Software.
  ~
  ~  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  ~  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  ~  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  ~  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  ~  LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  ~  OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  ~  WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  -->

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<pre><span class="sourceLineNo">001</span>/*<a name="line.1"></a>
<span class="sourceLineNo">002</span> * Copyright (c) 2016 Daniel Ennis (Aikar) - MIT License<a name="line.2"></a>
<span class="sourceLineNo">003</span> *<a name="line.3"></a>
<span class="sourceLineNo">004</span> *  Permission is hereby granted, free of charge, to any person obtaining<a name="line.4"></a>
<span class="sourceLineNo">005</span> *  a copy of this software and associated documentation files (the<a name="line.5"></a>
<span class="sourceLineNo">006</span> *  "Software"), to deal in the Software without restriction, including<a name="line.6"></a>
<span class="sourceLineNo">007</span> *  without limitation the rights to use, copy, modify, merge, publish,<a name="line.7"></a>
<span class="sourceLineNo">008</span> *  distribute, sublicense, and/or sell copies of the Software, and to<a name="line.8"></a>
<span class="sourceLineNo">009</span> *  permit persons to whom the Software is furnished to do so, subject to<a name="line.9"></a>
<span class="sourceLineNo">010</span> *  the following conditions:<a name="line.10"></a>
<span class="sourceLineNo">011</span> *<a name="line.11"></a>
<span class="sourceLineNo">012</span> *  The above copyright notice and this permission notice shall be<a name="line.12"></a>
<span class="sourceLineNo">013</span> *  included in all copies or substantial portions of the Software.<a name="line.13"></a>
<span class="sourceLineNo">014</span> *<a name="line.14"></a>
<span class="sourceLineNo">015</span> *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,<a name="line.15"></a>
<span class="sourceLineNo">016</span> *  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF<a name="line.16"></a>
<span class="sourceLineNo">017</span> *  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND<a name="line.17"></a>
<span class="sourceLineNo">018</span> *  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE<a name="line.18"></a>
<span class="sourceLineNo">019</span> *  LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION<a name="line.19"></a>
<span class="sourceLineNo">020</span> *  OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION<a name="line.20"></a>
<span class="sourceLineNo">021</span> *  WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.<a name="line.21"></a>
<span class="sourceLineNo">022</span> */<a name="line.22"></a>
<span class="sourceLineNo">023</span><a name="line.23"></a>
<span class="sourceLineNo">024</span>package co.aikar.taskchain;<a name="line.24"></a>
<span class="sourceLineNo">025</span><a name="line.25"></a>
<span class="sourceLineNo">026</span>import java.util.HashMap;<a name="line.26"></a>
<span class="sourceLineNo">027</span>import java.util.List;<a name="line.27"></a>
<span class="sourceLineNo">028</span>import java.util.Map;<a name="line.28"></a>
<span class="sourceLineNo">029</span>import java.util.concurrent.CompletableFuture;<a name="line.29"></a>
<span class="sourceLineNo">030</span>import java.util.concurrent.ConcurrentLinkedQueue;<a name="line.30"></a>
<span class="sourceLineNo">031</span>import java.util.function.BiConsumer;<a name="line.31"></a>
<span class="sourceLineNo">032</span>import java.util.function.Consumer;<a name="line.32"></a>
<span class="sourceLineNo">033</span>import java.util.stream.Collectors;<a name="line.33"></a>
<span class="sourceLineNo">034</span><a name="line.34"></a>
<span class="sourceLineNo">035</span>public class BaseTaskChain&lt;T&gt; implements TaskChain&lt;T&gt; {<a name="line.35"></a>
<span class="sourceLineNo">036</span>    static final ThreadLocal&lt;TaskChain&lt;?&gt;&gt; currentChain = new ThreadLocal&lt;&gt;();<a name="line.36"></a>
<span class="sourceLineNo">037</span><a name="line.37"></a>
<span class="sourceLineNo">038</span>    private final GameInterface impl;<a name="line.38"></a>
<span class="sourceLineNo">039</span>    private final TaskChainFactory factory;<a name="line.39"></a>
<span class="sourceLineNo">040</span>    private final Map&lt;String, Object&gt; taskMap = new HashMap&lt;&gt;(0);<a name="line.40"></a>
<span class="sourceLineNo">041</span>    private final ConcurrentLinkedQueue&lt;TaskHolder&lt;?,?&gt;&gt; chainQueue = new ConcurrentLinkedQueue&lt;&gt;();<a name="line.41"></a>
<span class="sourceLineNo">042</span><a name="line.42"></a>
<span class="sourceLineNo">043</span>    private int currentActionIndex = 0;<a name="line.43"></a>
<span class="sourceLineNo">044</span>    private int actionIndex = 0;<a name="line.44"></a>
<span class="sourceLineNo">045</span>    private boolean executed = false;<a name="line.45"></a>
<span class="sourceLineNo">046</span>    private boolean async = false;<a name="line.46"></a>
<span class="sourceLineNo">047</span>    private boolean done = false;<a name="line.47"></a>
<span class="sourceLineNo">048</span><a name="line.48"></a>
<span class="sourceLineNo">049</span>    private Object previous;<a name="line.49"></a>
<span class="sourceLineNo">050</span>    private TaskHolder&lt;?, ?&gt; currentHolder;<a name="line.50"></a>
<span class="sourceLineNo">051</span>    private Consumer&lt;Boolean&gt; doneCallback;<a name="line.51"></a>
<span class="sourceLineNo">052</span>    private BiConsumer&lt;Exception, TaskChainTasks.Task&lt;?, ?&gt;&gt; errorHandler;<a name="line.52"></a>
<span class="sourceLineNo">053</span><a name="line.53"></a>
<span class="sourceLineNo">054</span>    /* ======================================================================================== */<a name="line.54"></a>
<span class="sourceLineNo">055</span>    BaseTaskChain(TaskChainFactory factory) {<a name="line.55"></a>
<span class="sourceLineNo">056</span>        this.factory = factory;<a name="line.56"></a>
<span class="sourceLineNo">057</span>        this.impl = factory.getImplementation();<a name="line.57"></a>
<span class="sourceLineNo">058</span>    }<a name="line.58"></a>
<span class="sourceLineNo">059</span><a name="line.59"></a>
<span class="sourceLineNo">060</span>    /* ======================================================================================== */<a name="line.60"></a>
<span class="sourceLineNo">061</span><a name="line.61"></a>
<span class="sourceLineNo">062</span>    @Override<a name="line.62"></a>
<span class="sourceLineNo">063</span>    public BaseTaskChain&lt;T&gt; getImplChain() {<a name="line.63"></a>
<span class="sourceLineNo">064</span>        return this;<a name="line.64"></a>
<span class="sourceLineNo">065</span>    }<a name="line.65"></a>
<span class="sourceLineNo">066</span><a name="line.66"></a>
<span class="sourceLineNo">067</span>    GameInterface getGameImpl() {<a name="line.67"></a>
<span class="sourceLineNo">068</span>        return impl;<a name="line.68"></a>
<span class="sourceLineNo">069</span>    }<a name="line.69"></a>
<span class="sourceLineNo">070</span><a name="line.70"></a>
<span class="sourceLineNo">071</span>    // &lt;editor-fold desc="// API Methods - Getters &amp; Setters"&gt;<a name="line.71"></a>
<span class="sourceLineNo">072</span>    /**<a name="line.72"></a>
<span class="sourceLineNo">073</span>     * Called in an executing task, get the current action index.<a name="line.73"></a>
<span class="sourceLineNo">074</span>     * For every action that adds a task to the chain, the action index is increased.<a name="line.74"></a>
<span class="sourceLineNo">075</span>     *<a name="line.75"></a>
<span class="sourceLineNo">076</span>     * Useful in error or done handlers to know where you are in the chain when it aborted or threw exception.<a name="line.76"></a>
<span class="sourceLineNo">077</span>     * @return The current index<a name="line.77"></a>
<span class="sourceLineNo">078</span>     */<a name="line.78"></a>
<span class="sourceLineNo">079</span>    public int getCurrentActionIndex() {<a name="line.79"></a>
<span class="sourceLineNo">080</span>        return currentActionIndex;<a name="line.80"></a>
<span class="sourceLineNo">081</span>    }<a name="line.81"></a>
<span class="sourceLineNo">082</span><a name="line.82"></a>
<span class="sourceLineNo">083</span>    /**<a name="line.83"></a>
<span class="sourceLineNo">084</span>     * Changes the done callback handler for this chain<a name="line.84"></a>
<span class="sourceLineNo">085</span>     * @param doneCallback The handler<a name="line.85"></a>
<span class="sourceLineNo">086</span>     */<a name="line.86"></a>
<span class="sourceLineNo">087</span>    @SuppressWarnings("WeakerAccess")<a name="line.87"></a>
<span class="sourceLineNo">088</span>    public void setDoneCallback(Consumer&lt;Boolean&gt; doneCallback) {<a name="line.88"></a>
<span class="sourceLineNo">089</span>        this.doneCallback = doneCallback;<a name="line.89"></a>
<span class="sourceLineNo">090</span>    }<a name="line.90"></a>
<span class="sourceLineNo">091</span><a name="line.91"></a>
<span class="sourceLineNo">092</span>    /**<a name="line.92"></a>
<span class="sourceLineNo">093</span>     * @return The current error handler or null<a name="line.93"></a>
<span class="sourceLineNo">094</span>     */<a name="line.94"></a>
<span class="sourceLineNo">095</span>    public BiConsumer&lt;Exception, TaskChainTasks.Task&lt;?, ?&gt;&gt; getErrorHandler() {<a name="line.95"></a>
<span class="sourceLineNo">096</span>        return errorHandler;<a name="line.96"></a>
<span class="sourceLineNo">097</span>    }<a name="line.97"></a>
<span class="sourceLineNo">098</span><a name="line.98"></a>
<span class="sourceLineNo">099</span>    /**<a name="line.99"></a>
<span class="sourceLineNo">100</span>     * Changes the error handler for this chain<a name="line.100"></a>
<span class="sourceLineNo">101</span>     * @param errorHandler The error handler<a name="line.101"></a>
<span class="sourceLineNo">102</span>     */<a name="line.102"></a>
<span class="sourceLineNo">103</span>    @SuppressWarnings("WeakerAccess")<a name="line.103"></a>
<span class="sourceLineNo">104</span>    public void setErrorHandler(BiConsumer&lt;Exception, TaskChainTasks.Task&lt;?, ?&gt;&gt; errorHandler) {<a name="line.104"></a>
<span class="sourceLineNo">105</span>        this.errorHandler = errorHandler;<a name="line.105"></a>
<span class="sourceLineNo">106</span>    }<a name="line.106"></a>
<span class="sourceLineNo">107</span>    // &lt;/editor-fold&gt;<a name="line.107"></a>
<span class="sourceLineNo">108</span><a name="line.108"></a>
<span class="sourceLineNo">109</span>    /* ======================================================================================== */<a name="line.109"></a>
<span class="sourceLineNo">110</span><a name="line.110"></a>
<span class="sourceLineNo">111</span>    /**<a name="line.111"></a>
<span class="sourceLineNo">112</span>     * Checks if the chain has a value saved for the specified key.<a name="line.112"></a>
<span class="sourceLineNo">113</span>     * @param key Key to check if Task Data has a value for<a name="line.113"></a>
<span class="sourceLineNo">114</span>     */<a name="line.114"></a>
<span class="sourceLineNo">115</span>    @SuppressWarnings("WeakerAccess")<a name="line.115"></a>
<span class="sourceLineNo">116</span>    public boolean hasTaskData(String key) {<a name="line.116"></a>
<span class="sourceLineNo">117</span>        return taskMap.containsKey(key);<a name="line.117"></a>
<span class="sourceLineNo">118</span>    }<a name="line.118"></a>
<span class="sourceLineNo">119</span><a name="line.119"></a>
<span class="sourceLineNo">120</span>    /**<a name="line.120"></a>
<span class="sourceLineNo">121</span>     * Retrieves a value relating to a specific key, saved by a previous task.<a name="line.121"></a>
<span class="sourceLineNo">122</span>     *<a name="line.122"></a>
<span class="sourceLineNo">123</span>     * @param key Key to look up Task Data for<a name="line.123"></a>
<span class="sourceLineNo">124</span>     * @param &lt;R&gt; Type the Task Data value is expected to be<a name="line.124"></a>
<span class="sourceLineNo">125</span>     */<a name="line.125"></a>
<span class="sourceLineNo">126</span>    @SuppressWarnings("WeakerAccess")<a name="line.126"></a>
<span class="sourceLineNo">127</span>    public &lt;R&gt; R getTaskData(String key) {<a name="line.127"></a>
<span class="sourceLineNo">128</span>        //noinspection unchecked<a name="line.128"></a>
<span class="sourceLineNo">129</span>        return (R) taskMap.get(key);<a name="line.129"></a>
<span class="sourceLineNo">130</span>    }<a name="line.130"></a>
<span class="sourceLineNo">131</span><a name="line.131"></a>
<span class="sourceLineNo">132</span>    /**<a name="line.132"></a>
<span class="sourceLineNo">133</span>     * Saves a value for this chain so that a task furthur up the chain can access it.<a name="line.133"></a>
<span class="sourceLineNo">134</span>     *<a name="line.134"></a>
<span class="sourceLineNo">135</span>     * Useful for passing multiple values to the next (or furthur) tasks.<a name="line.135"></a>
<span class="sourceLineNo">136</span>     *<a name="line.136"></a>
<span class="sourceLineNo">137</span>     * @param key Key to store in Task Data<a name="line.137"></a>
<span class="sourceLineNo">138</span>     * @param val Value to store in Task Data<a name="line.138"></a>
<span class="sourceLineNo">139</span>     * @param &lt;R&gt; Type the Task Data value is expected to be<a name="line.139"></a>
<span class="sourceLineNo">140</span>     */<a name="line.140"></a>
<span class="sourceLineNo">141</span>    @SuppressWarnings("WeakerAccess")<a name="line.141"></a>
<span class="sourceLineNo">142</span>    public &lt;R&gt; R setTaskData(String key, Object val) {<a name="line.142"></a>
<span class="sourceLineNo">143</span>        //noinspection unchecked<a name="line.143"></a>
<span class="sourceLineNo">144</span>        return (R) taskMap.put(key, val);<a name="line.144"></a>
<span class="sourceLineNo">145</span>    }<a name="line.145"></a>
<span class="sourceLineNo">146</span><a name="line.146"></a>
<span class="sourceLineNo">147</span>    /**<a name="line.147"></a>
<span class="sourceLineNo">148</span>     * Removes a saved value on the chain.<a name="line.148"></a>
<span class="sourceLineNo">149</span>     *<a name="line.149"></a>
<span class="sourceLineNo">150</span>     * @param key Key to remove from Task Data<a name="line.150"></a>
<span class="sourceLineNo">151</span>     * @param &lt;R&gt; Type the Task Data value is expected to be<a name="line.151"></a>
<span class="sourceLineNo">152</span>     */<a name="line.152"></a>
<span class="sourceLineNo">153</span>    @SuppressWarnings("WeakerAccess")<a name="line.153"></a>
<span class="sourceLineNo">154</span>    public &lt;R&gt; R removeTaskData(String key) {<a name="line.154"></a>
<span class="sourceLineNo">155</span>        //noinspection unchecked<a name="line.155"></a>
<span class="sourceLineNo">156</span>        return (R) taskMap.remove(key);<a name="line.156"></a>
<span class="sourceLineNo">157</span>    }<a name="line.157"></a>
<span class="sourceLineNo">158</span><a name="line.158"></a>
<span class="sourceLineNo">159</span>    /**<a name="line.159"></a>
<span class="sourceLineNo">160</span>     * Finished adding tasks, begins executing them with a done notifier and error handler<a name="line.160"></a>
<span class="sourceLineNo">161</span>     * @param done The Callback to handle when the chain has finished completion. Argument to consumer contains finish state<a name="line.161"></a>
<span class="sourceLineNo">162</span>     * @param errorHandler The Error handler to handle exceptions<a name="line.162"></a>
<span class="sourceLineNo">163</span>     */<a name="line.163"></a>
<span class="sourceLineNo">164</span>    public void execute(Consumer&lt;Boolean&gt; done, BiConsumer&lt;Exception, TaskChainTasks.Task&lt;?, ?&gt;&gt; errorHandler) {<a name="line.164"></a>
<span class="sourceLineNo">165</span>        if (errorHandler == null) {<a name="line.165"></a>
<span class="sourceLineNo">166</span>            errorHandler = factory.getDefaultErrorHandler();<a name="line.166"></a>
<span class="sourceLineNo">167</span>        }<a name="line.167"></a>
<span class="sourceLineNo">168</span>        this.doneCallback = done;<a name="line.168"></a>
<span class="sourceLineNo">169</span>        this.errorHandler = errorHandler;<a name="line.169"></a>
<span class="sourceLineNo">170</span>        execute0();<a name="line.170"></a>
<span class="sourceLineNo">171</span>    }<a name="line.171"></a>
<span class="sourceLineNo">172</span><a name="line.172"></a>
<span class="sourceLineNo">173</span>    /* ======================================================================================== */<a name="line.173"></a>
<span class="sourceLineNo">174</span>    // &lt;editor-fold desc="// Implementation Details"&gt;<a name="line.174"></a>
<span class="sourceLineNo">175</span>    &lt;A1, A2, A3&gt; void handleAbortAction(TaskChainAbortAction&lt;A1, A2, A3&gt; action, A1 arg1, A2 arg2, A3 arg3) {<a name="line.175"></a>
<span class="sourceLineNo">176</span>        if (action != null) {<a name="line.176"></a>
<span class="sourceLineNo">177</span>            final TaskChain&lt;?&gt; prev = currentChain.get();<a name="line.177"></a>
<span class="sourceLineNo">178</span>            try {<a name="line.178"></a>
<span class="sourceLineNo">179</span>                currentChain.set(this);<a name="line.179"></a>
<span class="sourceLineNo">180</span>                action.onAbort(this, arg1, arg2, arg3);<a name="line.180"></a>
<span class="sourceLineNo">181</span>            } catch (Exception e) {<a name="line.181"></a>
<span class="sourceLineNo">182</span>                TaskChainUtil.logError("TaskChain Exception in Abort Action handler: " + action.getClass().getName());<a name="line.182"></a>
<span class="sourceLineNo">183</span>                TaskChainUtil.logError("Current Action Index was: " + currentActionIndex);<a name="line.183"></a>
<span class="sourceLineNo">184</span>                e.printStackTrace();<a name="line.184"></a>
<span class="sourceLineNo">185</span>            } finally {<a name="line.185"></a>
<span class="sourceLineNo">186</span>                currentChain.set(prev);<a name="line.186"></a>
<span class="sourceLineNo">187</span>            }<a name="line.187"></a>
<span class="sourceLineNo">188</span>        }<a name="line.188"></a>
<span class="sourceLineNo">189</span>        TaskChain.abort();<a name="line.189"></a>
<span class="sourceLineNo">190</span>    }<a name="line.190"></a>
<span class="sourceLineNo">191</span><a name="line.191"></a>
<span class="sourceLineNo">192</span>    void execute0() {<a name="line.192"></a>
<span class="sourceLineNo">193</span>        synchronized (this) {<a name="line.193"></a>
<span class="sourceLineNo">194</span>            if (this.executed) {<a name="line.194"></a>
<span class="sourceLineNo">195</span>                throw new RuntimeException("Already executed");<a name="line.195"></a>
<span class="sourceLineNo">196</span>            }<a name="line.196"></a>
<span class="sourceLineNo">197</span>            this.executed = true;<a name="line.197"></a>
<span class="sourceLineNo">198</span>        }<a name="line.198"></a>
<span class="sourceLineNo">199</span>        async = !impl.isMainThread();<a name="line.199"></a>
<span class="sourceLineNo">200</span>        nextTask();<a name="line.200"></a>
<span class="sourceLineNo">201</span>    }<a name="line.201"></a>
<span class="sourceLineNo">202</span><a name="line.202"></a>
<span class="sourceLineNo">203</span>    void done(boolean finished) {<a name="line.203"></a>
<span class="sourceLineNo">204</span>        this.done = true;<a name="line.204"></a>
<span class="sourceLineNo">205</span>        if (this.doneCallback != null) {<a name="line.205"></a>
<span class="sourceLineNo">206</span>            final TaskChain&lt;?&gt; prev = currentChain.get();<a name="line.206"></a>
<span class="sourceLineNo">207</span>            try {<a name="line.207"></a>
<span class="sourceLineNo">208</span>                currentChain.set(this);<a name="line.208"></a>
<span class="sourceLineNo">209</span>                this.doneCallback.accept(finished);<a name="line.209"></a>
<span class="sourceLineNo">210</span>            } catch (Exception e) {<a name="line.210"></a>
<span class="sourceLineNo">211</span>                this.handleError(e, null);<a name="line.211"></a>
<span class="sourceLineNo">212</span>            } finally {<a name="line.212"></a>
<span class="sourceLineNo">213</span>                currentChain.set(prev);<a name="line.213"></a>
<span class="sourceLineNo">214</span>            }<a name="line.214"></a>
<span class="sourceLineNo">215</span>        }<a name="line.215"></a>
<span class="sourceLineNo">216</span>    }<a name="line.216"></a>
<span class="sourceLineNo">217</span><a name="line.217"></a>
<span class="sourceLineNo">218</span>    &lt;R&gt; TaskChain&lt;R&gt; add0(Boolean async, TaskChainTasks.Task task) {<a name="line.218"></a>
<span class="sourceLineNo">219</span>        //noinspection unchecked<a name="line.219"></a>
<span class="sourceLineNo">220</span>        return add0(new TaskHolder&lt;&gt;(this, async, task));<a name="line.220"></a>
<span class="sourceLineNo">221</span>    }<a name="line.221"></a>
<span class="sourceLineNo">222</span><a name="line.222"></a>
<span class="sourceLineNo">223</span>    @SuppressWarnings({"rawtypes", "WeakerAccess"})<a name="line.223"></a>
<span class="sourceLineNo">224</span>    &lt;R&gt; TaskChain&lt;R&gt; add0(TaskHolder&lt;R,?&gt; task) {<a name="line.224"></a>
<span class="sourceLineNo">225</span>        synchronized (this) {<a name="line.225"></a>
<span class="sourceLineNo">226</span>            if (this.executed) {<a name="line.226"></a>
<span class="sourceLineNo">227</span>                throw new RuntimeException("TaskChain is executing");<a name="line.227"></a>
<span class="sourceLineNo">228</span>            }<a name="line.228"></a>
<span class="sourceLineNo">229</span>        }<a name="line.229"></a>
<span class="sourceLineNo">230</span><a name="line.230"></a>
<span class="sourceLineNo">231</span>        this.chainQueue.add(task);<a name="line.231"></a>
<span class="sourceLineNo">232</span>        //noinspection unchecked<a name="line.232"></a>
<span class="sourceLineNo">233</span>        return (TaskChain&lt;R&gt;) this;<a name="line.233"></a>
<span class="sourceLineNo">234</span>    }<a name="line.234"></a>
<span class="sourceLineNo">235</span><a name="line.235"></a>
<span class="sourceLineNo">236</span>    /**<a name="line.236"></a>
<span class="sourceLineNo">237</span>     * Fires off the next task, and switches between Async/Sync as necessary.<a name="line.237"></a>
<span class="sourceLineNo">238</span>     */<a name="line.238"></a>
<span class="sourceLineNo">239</span>    private void nextTask() {<a name="line.239"></a>
<span class="sourceLineNo">240</span>        synchronized (this) {<a name="line.240"></a>
<span class="sourceLineNo">241</span>            this.currentHolder = this.chainQueue.poll();<a name="line.241"></a>
<span class="sourceLineNo">242</span>            if (this.currentHolder == null) {<a name="line.242"></a>
<span class="sourceLineNo">243</span>                this.done = true; // to ensure its done while synchronized<a name="line.243"></a>
<span class="sourceLineNo">244</span>            }<a name="line.244"></a>
<span class="sourceLineNo">245</span>        }<a name="line.245"></a>
<span class="sourceLineNo">246</span><a name="line.246"></a>
<span class="sourceLineNo">247</span>        if (this.currentHolder == null) {<a name="line.247"></a>
<span class="sourceLineNo">248</span>            this.previous = null;<a name="line.248"></a>
<span class="sourceLineNo">249</span>            // All Done!<a name="line.249"></a>
<span class="sourceLineNo">250</span>            this.done(true);<a name="line.250"></a>
<span class="sourceLineNo">251</span>            return;<a name="line.251"></a>
<span class="sourceLineNo">252</span>        }<a name="line.252"></a>
<span class="sourceLineNo">253</span><a name="line.253"></a>
<span class="sourceLineNo">254</span>        Boolean isNextAsync = this.currentHolder.async;<a name="line.254"></a>
<span class="sourceLineNo">255</span>        if (isNextAsync == null || factory.shutdown) {<a name="line.255"></a>
<span class="sourceLineNo">256</span>            this.currentHolder.run();<a name="line.256"></a>
<span class="sourceLineNo">257</span>        } else if (isNextAsync) {<a name="line.257"></a>
<span class="sourceLineNo">258</span>            if (this.async) {<a name="line.258"></a>
<span class="sourceLineNo">259</span>                this.currentHolder.run();<a name="line.259"></a>
<span class="sourceLineNo">260</span>            } else {<a name="line.260"></a>
<span class="sourceLineNo">261</span>                impl.postAsync(() -&gt; {<a name="line.261"></a>
<span class="sourceLineNo">262</span>                    this.async = true;<a name="line.262"></a>
<span class="sourceLineNo">263</span>                    this.currentHolder.run();<a name="line.263"></a>
<span class="sourceLineNo">264</span>                });<a name="line.264"></a>
<span class="sourceLineNo">265</span>            }<a name="line.265"></a>
<span class="sourceLineNo">266</span>        } else {<a name="line.266"></a>
<span class="sourceLineNo">267</span>            if (this.async) {<a name="line.267"></a>
<span class="sourceLineNo">268</span>                impl.postToMain(() -&gt; {<a name="line.268"></a>
<span class="sourceLineNo">269</span>                    this.async = false;<a name="line.269"></a>
<span class="sourceLineNo">270</span>                    this.currentHolder.run();<a name="line.270"></a>
<span class="sourceLineNo">271</span>                });<a name="line.271"></a>
<span class="sourceLineNo">272</span>            } else {<a name="line.272"></a>
<span class="sourceLineNo">273</span>                this.currentHolder.run();<a name="line.273"></a>
<span class="sourceLineNo">274</span>            }<a name="line.274"></a>
<span class="sourceLineNo">275</span>        }<a name="line.275"></a>
<span class="sourceLineNo">276</span>    }<a name="line.276"></a>
<span class="sourceLineNo">277</span><a name="line.277"></a>
<span class="sourceLineNo">278</span>    private void handleError(Throwable throwable, TaskChainTasks.Task&lt;?, ?&gt; task) {<a name="line.278"></a>
<span class="sourceLineNo">279</span>        Exception e = throwable instanceof Exception ? (Exception) throwable : new Exception(throwable);<a name="line.279"></a>
<span class="sourceLineNo">280</span>        if (errorHandler != null) {<a name="line.280"></a>
<span class="sourceLineNo">281</span>            final TaskChain&lt;?&gt; prev = currentChain.get();<a name="line.281"></a>
<span class="sourceLineNo">282</span>            try {<a name="line.282"></a>
<span class="sourceLineNo">283</span>                currentChain.set(this);<a name="line.283"></a>
<span class="sourceLineNo">284</span>                errorHandler.accept(e, task);<a name="line.284"></a>
<span class="sourceLineNo">285</span>            } catch (Exception e2) {<a name="line.285"></a>
<span class="sourceLineNo">286</span>                TaskChainUtil.logError("TaskChain Exception in the error handler!" + e2.getMessage());<a name="line.286"></a>
<span class="sourceLineNo">287</span>                TaskChainUtil.logError("Current Action Index was: " + currentActionIndex);<a name="line.287"></a>
<span class="sourceLineNo">288</span>                e.printStackTrace();<a name="line.288"></a>
<span class="sourceLineNo">289</span>            } finally {<a name="line.289"></a>
<span class="sourceLineNo">290</span>                currentChain.set(prev);<a name="line.290"></a>
<span class="sourceLineNo">291</span>            }<a name="line.291"></a>
<span class="sourceLineNo">292</span>        } else {<a name="line.292"></a>
<span class="sourceLineNo">293</span>            TaskChainUtil.logError("TaskChain Exception on " + (task != null ? task.getClass().getName() : "Done Hander") + ": " + e.getMessage());<a name="line.293"></a>
<span class="sourceLineNo">294</span>            TaskChainUtil.logError("Current Action Index was: " + currentActionIndex);<a name="line.294"></a>
<span class="sourceLineNo">295</span>            e.printStackTrace();<a name="line.295"></a>
<span class="sourceLineNo">296</span>        }<a name="line.296"></a>
<span class="sourceLineNo">297</span>    }<a name="line.297"></a>
<span class="sourceLineNo">298</span><a name="line.298"></a>
<span class="sourceLineNo">299</span>    private void abortChain() {<a name="line.299"></a>
<span class="sourceLineNo">300</span>        this.previous = null;<a name="line.300"></a>
<span class="sourceLineNo">301</span>        this.chainQueue.clear();<a name="line.301"></a>
<span class="sourceLineNo">302</span>        this.done(false);<a name="line.302"></a>
<span class="sourceLineNo">303</span>    }<a name="line.303"></a>
<span class="sourceLineNo">304</span><a name="line.304"></a>
<span class="sourceLineNo">305</span>    &lt;R&gt; CompletableFuture&lt;List&lt;R&gt;&gt; getFuture(List&lt;CompletableFuture&lt;R&gt;&gt; futures) {<a name="line.305"></a>
<span class="sourceLineNo">306</span>        CompletableFuture&lt;List&lt;R&gt;&gt; onDone = new CompletableFuture&lt;&gt;();<a name="line.306"></a>
<span class="sourceLineNo">307</span>        CompletableFuture&lt;?&gt;[] futureArray = new CompletableFuture&lt;?&gt;[futures.size()];<a name="line.307"></a>
<span class="sourceLineNo">308</span>        CompletableFuture.allOf((CompletableFuture&lt;?&gt;[]) futures.toArray(futureArray)).whenComplete((aVoid, throwable) -&gt; {<a name="line.308"></a>
<span class="sourceLineNo">309</span>            if (throwable != null) {<a name="line.309"></a>
<span class="sourceLineNo">310</span>                onDone.completeExceptionally(throwable);<a name="line.310"></a>
<span class="sourceLineNo">311</span>            } else {<a name="line.311"></a>
<span class="sourceLineNo">312</span>                boolean[] error = {false};<a name="line.312"></a>
<span class="sourceLineNo">313</span>                final List&lt;R&gt; results = futures.stream().map(f -&gt; {<a name="line.313"></a>
<span class="sourceLineNo">314</span>                    try {<a name="line.314"></a>
<span class="sourceLineNo">315</span>                        return f.join();<a name="line.315"></a>
<span class="sourceLineNo">316</span>                    } catch (Exception e) {<a name="line.316"></a>
<span class="sourceLineNo">317</span>                        error[0] = true;<a name="line.317"></a>
<span class="sourceLineNo">318</span>                        BaseTaskChain.this.handleError(e, BaseTaskChain.this.currentHolder.task);<a name="line.318"></a>
<span class="sourceLineNo">319</span>                        return null;<a name="line.319"></a>
<span class="sourceLineNo">320</span>                    }<a name="line.320"></a>
<span class="sourceLineNo">321</span>                }).collect(Collectors.toList());<a name="line.321"></a>
<span class="sourceLineNo">322</span>                if (error[0]) {<a name="line.322"></a>
<span class="sourceLineNo">323</span>                    onDone.completeExceptionally(new Exception("Future Dependant had an exception"));<a name="line.323"></a>
<span class="sourceLineNo">324</span>                } else {<a name="line.324"></a>
<span class="sourceLineNo">325</span>                    onDone.complete(results);<a name="line.325"></a>
<span class="sourceLineNo">326</span>                }<a name="line.326"></a>
<span class="sourceLineNo">327</span>            }<a name="line.327"></a>
<span class="sourceLineNo">328</span>        });<a name="line.328"></a>
<span class="sourceLineNo">329</span>        return onDone;<a name="line.329"></a>
<span class="sourceLineNo">330</span>    }<a name="line.330"></a>
<span class="sourceLineNo">331</span><a name="line.331"></a>
<span class="sourceLineNo">332</span>    // &lt;/editor-fold&gt;<a name="line.332"></a>
<span class="sourceLineNo">333</span>    /* ======================================================================================== */<a name="line.333"></a>
<span class="sourceLineNo">334</span>    // &lt;editor-fold desc="// TaskHolder"&gt;<a name="line.334"></a>
<span class="sourceLineNo">335</span>    /**<a name="line.335"></a>
<span class="sourceLineNo">336</span>     * Provides foundation of a task with what the previous task type should return<a name="line.336"></a>
<span class="sourceLineNo">337</span>     * to pass to this and what this task will return.<a name="line.337"></a>
<span class="sourceLineNo">338</span>     * @param &lt;R&gt; Return Type<a name="line.338"></a>
<span class="sourceLineNo">339</span>     * @param &lt;A&gt; Argument Type Expected<a name="line.339"></a>
<span class="sourceLineNo">340</span>     */<a name="line.340"></a>
<span class="sourceLineNo">341</span>    @SuppressWarnings("AccessingNonPublicFieldOfAnotherObject")<a name="line.341"></a>
<span class="sourceLineNo">342</span>    private static class TaskHolder&lt;R, A&gt; {<a name="line.342"></a>
<span class="sourceLineNo">343</span>        private final BaseTaskChain&lt;A&gt; chain;<a name="line.343"></a>
<span class="sourceLineNo">344</span>        private final TaskChainTasks.Task&lt;R, A&gt; task;<a name="line.344"></a>
<span class="sourceLineNo">345</span>        final Boolean async;<a name="line.345"></a>
<span class="sourceLineNo">346</span><a name="line.346"></a>
<span class="sourceLineNo">347</span>        private boolean executed = false;<a name="line.347"></a>
<span class="sourceLineNo">348</span>        private boolean aborted = false;<a name="line.348"></a>
<span class="sourceLineNo">349</span>        private final int actionIndex;<a name="line.349"></a>
<span class="sourceLineNo">350</span><a name="line.350"></a>
<span class="sourceLineNo">351</span>        TaskHolder(BaseTaskChain&lt;A&gt; chain, Boolean async, TaskChainTasks.Task&lt;R, A&gt; task) {<a name="line.351"></a>
<span class="sourceLineNo">352</span>            this.actionIndex = chain.actionIndex++;<a name="line.352"></a>
<span class="sourceLineNo">353</span>            this.task = task;<a name="line.353"></a>
<span class="sourceLineNo">354</span>            this.chain = chain;<a name="line.354"></a>
<span class="sourceLineNo">355</span>            this.async = async;<a name="line.355"></a>
<span class="sourceLineNo">356</span>        }<a name="line.356"></a>
<span class="sourceLineNo">357</span><a name="line.357"></a>
<span class="sourceLineNo">358</span>        /**<a name="line.358"></a>
<span class="sourceLineNo">359</span>         * Called internally by Task Chain to facilitate executing the task and then the next task.<a name="line.359"></a>
<span class="sourceLineNo">360</span>         */<a name="line.360"></a>
<span class="sourceLineNo">361</span>        private void run() {<a name="line.361"></a>
<span class="sourceLineNo">362</span>            final Object arg = this.chain.previous;<a name="line.362"></a>
<span class="sourceLineNo">363</span>            this.chain.previous = null;<a name="line.363"></a>
<span class="sourceLineNo">364</span>            this.chain.currentActionIndex = this.actionIndex;<a name="line.364"></a>
<span class="sourceLineNo">365</span>            final TaskChain&lt;?&gt; prevChain = currentChain.get();<a name="line.365"></a>
<span class="sourceLineNo">366</span>            try {<a name="line.366"></a>
<span class="sourceLineNo">367</span>                currentChain.set(this.chain);<a name="line.367"></a>
<span class="sourceLineNo">368</span>                if (this.task instanceof TaskChainTasks.FutureTask) {<a name="line.368"></a>
<span class="sourceLineNo">369</span>                    //noinspection unchecked<a name="line.369"></a>
<span class="sourceLineNo">370</span>                    final CompletableFuture&lt;R&gt; future = ((TaskChainTasks.FutureTask&lt;R, A&gt;) this.task).runFuture((A) arg);<a name="line.370"></a>
<span class="sourceLineNo">371</span>                    if (future == null) {<a name="line.371"></a>
<span class="sourceLineNo">372</span>                        throw new NullPointerException("Must return a Future");<a name="line.372"></a>
<span class="sourceLineNo">373</span>                    }<a name="line.373"></a>
<span class="sourceLineNo">374</span>                    future.whenComplete((r, throwable) -&gt; {<a name="line.374"></a>
<span class="sourceLineNo">375</span>                        if (throwable != null) {<a name="line.375"></a>
<span class="sourceLineNo">376</span>                            this.chain.handleError(throwable, this.task);<a name="line.376"></a>
<span class="sourceLineNo">377</span>                            this.abort();<a name="line.377"></a>
<span class="sourceLineNo">378</span>                        } else {<a name="line.378"></a>
<span class="sourceLineNo">379</span>                            this.next(r);<a name="line.379"></a>
<span class="sourceLineNo">380</span>                        }<a name="line.380"></a>
<span class="sourceLineNo">381</span>                    });<a name="line.381"></a>
<span class="sourceLineNo">382</span>                } else if (this.task instanceof TaskChainTasks.AsyncExecutingTask) {<a name="line.382"></a>
<span class="sourceLineNo">383</span>                    //noinspection unchecked<a name="line.383"></a>
<span class="sourceLineNo">384</span>                    ((TaskChainTasks.AsyncExecutingTask&lt;R, A&gt;) this.task).runAsync((A) arg, this::next);<a name="line.384"></a>
<span class="sourceLineNo">385</span>                } else {<a name="line.385"></a>
<span class="sourceLineNo">386</span>                    //noinspection unchecked<a name="line.386"></a>
<span class="sourceLineNo">387</span>                    next(this.task.run((A) arg));<a name="line.387"></a>
<span class="sourceLineNo">388</span>                }<a name="line.388"></a>
<span class="sourceLineNo">389</span>            } catch (Throwable e) {<a name="line.389"></a>
<span class="sourceLineNo">390</span>                //noinspection ConstantConditions<a name="line.390"></a>
<span class="sourceLineNo">391</span>                if (e instanceof AbortChainException) {<a name="line.391"></a>
<span class="sourceLineNo">392</span>                    this.abort();<a name="line.392"></a>
<span class="sourceLineNo">393</span>                    return;<a name="line.393"></a>
<span class="sourceLineNo">394</span>                }<a name="line.394"></a>
<span class="sourceLineNo">395</span>                this.chain.handleError(e, this.task);<a name="line.395"></a>
<span class="sourceLineNo">396</span>                this.abort();<a name="line.396"></a>
<span class="sourceLineNo">397</span>            } finally {<a name="line.397"></a>
<span class="sourceLineNo">398</span>                if (prevChain != null) {<a name="line.398"></a>
<span class="sourceLineNo">399</span>                    currentChain.set(prevChain);<a name="line.399"></a>
<span class="sourceLineNo">400</span>                } else {<a name="line.400"></a>
<span class="sourceLineNo">401</span>                    currentChain.remove();<a name="line.401"></a>
<span class="sourceLineNo">402</span>                }<a name="line.402"></a>
<span class="sourceLineNo">403</span>            }<a name="line.403"></a>
<span class="sourceLineNo">404</span>        }<a name="line.404"></a>
<span class="sourceLineNo">405</span><a name="line.405"></a>
<span class="sourceLineNo">406</span>        /**<a name="line.406"></a>
<span class="sourceLineNo">407</span>         * Abort the chain, and clear tasks for GC.<a name="line.407"></a>
<span class="sourceLineNo">408</span>         */<a name="line.408"></a>
<span class="sourceLineNo">409</span>        private synchronized void abort() {<a name="line.409"></a>
<span class="sourceLineNo">410</span>            this.aborted = true;<a name="line.410"></a>
<span class="sourceLineNo">411</span>            this.chain.abortChain();<a name="line.411"></a>
<span class="sourceLineNo">412</span>        }<a name="line.412"></a>
<span class="sourceLineNo">413</span><a name="line.413"></a>
<span class="sourceLineNo">414</span>        /**<a name="line.414"></a>
<span class="sourceLineNo">415</span>         * Accepts result of previous task and executes the next<a name="line.415"></a>
<span class="sourceLineNo">416</span>         */<a name="line.416"></a>
<span class="sourceLineNo">417</span>        private void next(Object resp) {<a name="line.417"></a>
<span class="sourceLineNo">418</span>            synchronized (this) {<a name="line.418"></a>
<span class="sourceLineNo">419</span>                if (this.aborted) {<a name="line.419"></a>
<span class="sourceLineNo">420</span>                    this.chain.done(false);<a name="line.420"></a>
<span class="sourceLineNo">421</span>                    return;<a name="line.421"></a>
<span class="sourceLineNo">422</span>                }<a name="line.422"></a>
<span class="sourceLineNo">423</span>                if (this.executed) {<a name="line.423"></a>
<span class="sourceLineNo">424</span>                    this.chain.done(false);<a name="line.424"></a>
<span class="sourceLineNo">425</span>                    throw new RuntimeException("This task has already been executed.");<a name="line.425"></a>
<span class="sourceLineNo">426</span>                }<a name="line.426"></a>
<span class="sourceLineNo">427</span>                this.executed = true;<a name="line.427"></a>
<span class="sourceLineNo">428</span>            }<a name="line.428"></a>
<span class="sourceLineNo">429</span><a name="line.429"></a>
<span class="sourceLineNo">430</span>            this.chain.async = !this.chain.impl.isMainThread(); // We don't know where the task called this from.<a name="line.430"></a>
<span class="sourceLineNo">431</span>            this.chain.previous = resp;<a name="line.431"></a>
<span class="sourceLineNo">432</span>            this.chain.nextTask();<a name="line.432"></a>
<span class="sourceLineNo">433</span>        }<a name="line.433"></a>
<span class="sourceLineNo">434</span>    }<a name="line.434"></a>
<span class="sourceLineNo">435</span>    // &lt;/editor-fold&gt;<a name="line.435"></a>
<span class="sourceLineNo">436</span>}<a name="line.436"></a>




























































</pre>
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